MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
312
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 5-14-5 Removing the timing system
Removing the timing system
③
.
Unscrew the 15 hexagon flange bolts (M6 × 16, M10 ×
35 and M10 × 50) fastening the timing hood
components
Ⅰ
and
Ⅱ
and the timing hood on the front
end of the engine, and take off the timing hood
components
Ⅰ
and
Ⅱ
and the timing hood on the cylinder
head and the front end of the cylinder body. See Fig.
5-14-5.
(2) Remove the timing tension pulley assembly: loosen
the combined fastening bolt of timing tension pulley and
remove the timing tension pulley. See Fig. 5-14-5.
(3) Remove the timing belt.
(4) Remove the timing idle wheel assembly: unscrew
the fastening bolts of the timing idle wheel, and remove
the timing idle wheel assembly.
Fig. 5-14-6 Removing the lower body
assembly of oil pan
Fig. 5-14-7 Removing and installing the oil
pump assembly
Removing the lower body assembly of oil pan
④
(1) Use a spanner to remove the 14 hexagon flange
bolts (M6×12) fastening the lower body of oil pan to the
upper body of oil pan in proper order.
(2) Take off the oil pan lower body from the upper body.
See Fig. 5-14-6.
Removing the oil pump assembly
⑤
(1) Remove the 10 hexagon bolt and plain washer
subassemblies (M8×40, M8×25 and M8×20) fastening
the engine oil pump assembly to the cylinder body in
proper order, and remove the engine oil pump
assembly. See Fig. 5-14-7.
(2) Take out the outer rotor of oil pump and rubber seal
ring from the oil pump chamber of upper cylinder body.
(3) Take out the front oil seal of crankshaft through the
oil seal hole of oil pump crankshaft.
Front oil seal stripper: 5-8840-2362-0.
Attention:
Do not damage the mating surface of
front oil seal of crankshaft when removing it.
(4) Check the rubber seal ring of oil pump and front oil
seal of crankshaft and replace them if there is any
deformation or damage.
Installation
Installing the oil pump assembly
⑤
(1) Apply a small amount of lubricating oil to the seal
ring of oil pump, and embed the seal ring into the
bottom of the corresponding groove of oil pump
housing. There should not be any scratch, skew or
impropriety.
Lower body of
oil pan
Upper body of oil pan
Outer rotor
Seal ring
Front oil seal
